Enhanced Security of Attribute-Based Signatures
| Autor: | Johannes Blömer, Jakob Juhnke, Fabian Eidens |
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| Rok vydání: | 2018 |
| Předmět: |
Theoretical computer science
Extant taxon 010201 computation theory & mathematics Computer science Feature (computer vision) Universal composability 0202 electrical engineering electronic engineering information engineering 020201 artificial intelligence & image processing 0102 computer and information sciences 02 engineering and technology 01 natural sciences Signature (logic) |
| Zdroj: | Cryptology and Network Security ISBN: 9783030004330 CANS |
| DOI: | 10.1007/978-3-030-00434-7_12 |
| Popis: | Despite the recent advances in attribute-based signatures (ABS), no schemes have yet been considered under a strong privacy definition. We enhance the security of ABS by presenting a strengthened simulation-based privacy definition and the first attribute-based signature functionality in the framework of universal composability (UC). Additionally, we show that the UC definition is equivalent to our strengthened experiment-based security definitions. To achieve this we rely on a general unforgeability and a simulation-based privacy definition that is stronger than standard indistinguishability-based privacy. Further, we show that two extant concrete ABS constructions satisfy this simulation-based privacy definition and are therefore UC secure. The two concrete constructions are the schemes by Sakai et al. (PKC’16) and by Maji et al. (CT-RSA’11). Additionally, we identify the common feature that allows these schemes to meet our privacy definition, giving us further insights into the security requirements of ABS. |
| Databáze: | OpenAIRE |
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